What will you do when NameNode is down?

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What infrastructure do we need to process 100 TB data using Hadoop?

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On which port does ssh work?

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Are Namenode and job tracker on the same host?

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How Mapper is instantiated in a running job?

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Define a job tracker?

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How would you use Map/Reduce to split a very large graph into smaller pieces and parallelize the computation of edges according to the fast/dynamic change of data?

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What is salary of hadoop developer?

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What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?

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Explain InputFormat?

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Can we call vms as pseudos?

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Data Engineer Given a list of followers in the format:123, 345234, 678345, 123…Where column one is the ID of the follower and column two is the ID of the followee. Find all mutual following pairs (the pair 123, 345 in the example above). How would you use Map/Reduce to solve the problem when the list does not fit in memory?

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